Dell OptiPlex GX280 - Manual (Page 9)

3. Press the card-clip lever toward the PCI card slot and gently press the card into the PCI Express x16 slot until it clicks into place.
4. Release the card-clip lever, ensuring that the tab on the card-clip lever fits into the notch on the front end of the card.
5. Secure the card by lowering the hinged lever on the back panel.
6. Close the computer cover.
7. Connect the monitor cable to the card's video connector.
8. Connect your computer and devices to electrical outlets, and turn them on.
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3 card-clip tab
4 card clip
5 PCI card slot
NOTICE: To connect a network cable, first plug the cable into the network wall jack, and then plug it into the computer.